L48A1 Mast Section The cause of the broken shaft of the Rotary Motor caused by the sudden swing and reversal of the tower crane
If the construction site in the tower crane rotary positioning, by adopting the measure of making a sharp turn, which is commonly known as a reverse turn, the entire turning mechanism is suddenly added a reverse starting torque on the basis of the normal turning torque This largely exceeds the rated torque that can be sustained by the slewing mechanism. Although the input shaft of the Rotary reducer is smaller than the output shaft of the Rotary Motor, the output shaft of the Rotary Motor will be broken due to the excessive torque due to the static pressure dump hydraulic coupling which can isolate the vibration and moderate the impact. At present, the rotating machinery of tower crane in our country is commonly adopted as a type of electrical machinery .
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A hydraulic coupling -- a rotating reducer -- a type of revolving support. Large tower cranes are equipped with Rotary Motors with frequency conversion or wound Rotor asynchronous motors to reduce the rotary starting speed and Torque, while medium and small tower cranes are limited by the production cost Most asynchronous motors or multi-speed asynchronous motors are used, and only the hydraulic coupling is used to mitigate the start-up impact. However, the hydraulic coupling used is usually static-pressure-dump type, and the performance of protection against dynamic overload is poor It makes the small and medium-sized tower crane's turning moment larger, and can not effectively protect the whole mechanism from dynamic overload.
L48A1 mast section is the best in this field
